This promises to be one of the most interesting and most beautiful of the American Mountain Series, with superb photographs and text based on the experienced and expert knowledge of the canyon country, chiefly that of Weldon F. Heald and Edwin D. McKee. The scenic sites, the natural phenomena, the uncommon beauty of the canyons; the years of exploration, first Spanish, then American; fossil life; Indians; the colossus- the Colorado River- and the little impress made by man; the wilderness and the last frontier; canyon climbing and the practicalities thereof; the trails, individually covered; climate and shrubs and flowers, bird and animal life- all combine to provide informative, descriptive material for those that want more than the routine guidebook introduction.